How to input transient pressure data as BC in pre?
 

Hi.. I have two column of experimental data: time t & transient static pressure P(t) stored in a csv file. I wish to use P(t) as my outlet boundary condition in transient simulation.

However, I failed to initialise these data in Pre V.10.

I get an error message when I use "initialise profile data":

Invalid format .... ....unrecognised heading ....expected to read.... [spatial fields] section headings

Can anyone give me some ideas how to input the transient pressure data to Pre so that I can specify P(t) at the outlet BC.

Thank you for your help.

Re: How to input transient pressure data as BC in
 

Exist in CFX help one tutorial that explain this, but i fogive was that!!

forgive my bad english!

Re: How to input transient pressure data as BC in
 

Hi Camilo,

I found 5 (CFX 10) tutorials that talk about transient simulation.

Tutorial 4:Flow from a circular vent

Tutorial 6:Buoyant Flow in a partitioned cavity

Tutorial 12:Flow in an axial rotor/stator

Tutorial 17:Air Conditioning simulation

Tutorial 20:Fluid Structure Interaction and Mesh deformation

Tutorial 4 use formula ExpFunction to express transient term and do not use data imported from a text/csv file.

Tutorial 6 seems to use a fixed value for BC.

can't find any relavant info in Tutorial 12 as well.

Tutorial 17 uses the user subroutines ect but I can't find any methods to input t & P(t) from a csv file and use them for boundary condition.

I can't find any relavant info in Tutorial 20 either.

Did I miss out anything in tutorial? Would you mind to tell me which tutorial has the information I need? I have already spend hours to hunt for it.

Thank you very much.

Re: How to input transient pressure data as BC in
 

I will sugest this!!

go in expressions anda set this example:

"2*sin((t/1[s]))[Pa] + 415[Pa]" ---> (CALL THIS VP)

clic in plot and define of 0 at 10s.

The pressure varable with time.

Go to bonduary condition that have inlet or outlet and clic in "Enter Expression" and put the name "VP"

forgive my bad english

Re: How to input transient pressure data as BC in
 

Check following thread replying to similar query.

http://www.cfd-online.com/Forum/cfx_...cgi?read=12825

Hope this helps.

Kind regards,

Chirag